Incinerator flue



Sept 13, 1966 GORDON 3,272,197

INCINERATOR FLUE Filed Jan. 4, 1965 INVENTOR.

EDWARD L.GORDON s ATTORNEY United States Patent 3,272,197 INCINERATOR FLUE Edward L. Gordon, 2001 Center Ave., Pittsburgh, Pa. Filed Jan. 4, 1965, Ser. No. 423,258 2 Claims. (Cl. 126307) This invention relates generally to a flue construction and, more particularly, to the construction of a conduit which connects an incinerator to a chimney to prevent overheating of the conduit.

In the past, conduits leading from an incinerator to a chimney, because of the intense heat developed in the incinerator, have become so hot, that is as high as 1800 F., as to make the room too hot for use, as well as creating a fire hazard, particularly at the connection with the chimney. Attempts have been made to insulate such conduit but this does not reduce the temperature thereof and, in fact, increases it so as to make the fire danger more hazardous at the chimney.

An object of my invention is to overcome the abovementioned disadvantages by providing a conduit construction which induces cooling of the conduit by the surrounding air and chimney effect, thereby bringing the conduit temperature down to a safe value so as to avoid overheating of the room and at the same time eliminating the necessity of an insulating sheath or cover.

Other objects and advantages of the invention will become more apparent from a study of the following description taken with the accompanying drawing wherein:

FIG. 1 is an elevational View showing a flue or conduit construction embodying the present invention; and

FIG. 2 is an enlarged, cross-sectional view taken along line IIII of FIG. 1.

Referring more particularly to the drawing, numeral 1 generally denotes an incinerator of any well known construction having an outlet connection 2 which is slipfitted to a metallic pipe or conduit 4 which has an end 7 for drawing heat in space 10 just short of chimney 9.

Spaced about and concentric with conduit 4 is a surrounding metallic conduit 5 which is held in such spaced relationship by spacers 6 located between the respective conduits. The discharge end 8 of conduit 5 extends through the chimney wall past end 7 of the interior conduit. The opposite end of conduit 5 is kept spaced from conduit 4 but is preferably tapered to a smaller diameter as shown so that outside air is drawn into the space between conduits 4 and 5, as shown by arrows 11a and allowed to expand somewhat after entering such space by the heat of the inner conduit 4.

As a consequence of the chimney eflect, air in the room is sucked into the space 11 between conduits 4 and 5 and drawn past end 7 into the chimney. Such air will greatly reduce the temperature of conduit 4 as well as "ice the connection between conduit 5 and chimney 9. Therefore, the temperature of the laundry room or Whatever room incinerator 1 is located in is not overheated by conduit 4 as in the past. Moreover, insulation is not required for covering the flue conduit assembly and joints with the incinerator and chimney are not overheated to unsafe values.

While the conduit embodying the present invention has been described in connection with an incinerator, it is equally useful with a furnace or stove.

Thus it will be seen that I have provided an eflicient flue construction for an incinerator or furnace to prevent overheating of the room in which the incinerator is located as well as prevent overheating of the joint with the chimney, also which eliminates the necessity of an insulating sheath; furthermore, I have provided a conduit construction which is simple to manufacture and which involves minimum cost while preventing existing fire hazards attendant the use of incinerators.

While I have illustrated and described a single specific embodiment of my invention, it will be understood that and modifications may be made within the contemplation this is by way of illustration only, and that various changes of my invention and within the scope of the following claims.

I claim:

1. In combination with an incinerator and a chimney, a conduit assembly connecting the exhaust of said ininerator to a chimney, said conduit assembly comprising two concentric conduits, one contained within the other in spaced relationship, a plurality of radially extending spacer elements connected between said inner and outer conduits, the outer conduit being spaced from the inner conduit at the end to which the incinerator exhaust is connected so as to draw outside air into the space between said conduits as the result of chimney effect, the discharge end of only said outer conduit extending through the chimney wall, the discharge end of said inner conduit being spaced from said chimney wall.

2. The combination recited in claim 1 wherein said first-mentioned end of the outer conduit is reduced in cross-section.

References Cited by the Examiner UNITED STATES PATENTS 1,160,954 11/1915 Parker.

1,693,507 11/1928 Hull 126-312 2,713,301 7/1955 McKann 126307 X FOREIGN PATENTS 464,619 4/ 1937 Great Britain.

CHARLES J. MYHRE, Primary Examiner. 

1. IN COMBINATION WITH AN INCINERATOR AND A CHIMNEY, A CONDUIT ASSEMBLY CONNECTING THE EXHAUST OF SAID INCINERATOR TO A CHIMNEY, SAID CONDUIT ASSEMBLY COMPRISING TWO CONCENTRIC CONDUITS, ONE CONTAINED WITHIN THE OTHER IN SPACED RELATIONSHIP, A PLURALITY OF RADIALLY EXTENDING SPACER ELEMENTS CONNECTED BETWEEN SAID INNER AND OUTER CONDUITS, THE OUTER CONDUIT BEING SPACED FROM THE INNER CONDUIT AT THE END OF WHICH THE INCINERATOR EXHAUST IS CONNECTED SO AS TO DRAW OUTSIDE AIR INTO THE SPACE BETWEEN 